You can find the slider under the 'Visuals' or 'All' section, the setting is named schematicRenderDistance.
If you use litematica with big schematics in combination with Voxy/Distant Horizons/any client side extra chunk render mod. You might notice that schematics dont really render that far, this mod adds a slider that renders the schematics outside of your normal render distance.
Be warned that rendering more stuff is laggier. So rendering a huge amount of gigantic schematics is not performant.
The mod can also improve performance by lowering the schematic render distance, making it so theres less stuff to render and less strain on the gpu.
Join the discord You can ask for help, a mod, just suggest something, hangout or request the source code of any mod I have made (if I still have the source code)
Or donate to my Kofi incase you are feeling generous!

